Maartje Boer

CHAPTER 3 CROSS-NATIONAL VALIDATION OF THE SOCIAL MEDIA DISORDER-SCALE: FINDINGS FROM ADOLESCENTS FROM 44 COUNTRIES Maartje Boer, Regina J. J. M. van den Eijnden, Catrin Finkenauer, Meyran Boniel-Nissim, Claudia Marino, Jo Inchley, Alina Cosma, Leena Paakkari, and Gonneke W.J.M. Stevens Author Contributions MB, RvdE, CF, and GS conceived of the study. MB conducted the literature review, data analyses, and drafted the majority of the initial and revised manuscript. CM and AC drafted parts of the methods and discussion section. GS, RvdE, and CF advised during all stages of preparing and revising the manuscript. JI was the international coordinator of the HBSC study. All authors critically reviewed the initial and reviewed manuscript, and approved of the final manuscript. Publication Boer, M., Van den Eijnden, R. J. J. M., Finkenauer, C., Boniel-Nissim, M., Marino, C., Inchley, J., Cosma, A., Paakkari, L., & Stevens, G. W. J. M. (2022). Cross-national validation of the Social Media Disorder-Scale: Findings from adolescents from 44 countries. Addiction, 117 (3), 784-795. https://doi.org/10.1111/add.15709